如果要用was it for their help ,就是用于现在相反的虚拟语态,但是给出的句子后半部分,不符合主句用would/ should/ could/ might +动词原形的形式,所以不是虚拟句. 就应该用but for,做让步状语从句. 如还有疑问,欢迎可以进入乐知各级别英语外教课免费旁听. 希望能帮到您
But for their help , we could not have finished the work on time.这是一个含虚拟语气的句子,后面部分的谓语 could not have finished 表示与过去事实相反的虚拟结果(事实上我们完成了),如果句子写完整,会是这样:If it had not been for their help ,we could not have...